Gravitation — Science STD 9 — Question

Name one pair of substances whose mixture can be separated completely by distillation.

When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?

Can we hear (a) infrasonic waves (b) ultrasonic waves?

In which medium, air or water, an echo is heard much sooner? Why?

What does the slope of a distance-time graph indicate?

What will increase, if we change feeble sound to loud sound?

Name the tube which connects the middle ear to throat.

Write down four main characteristics of good cattle shelter.

Which type of simple tissue is used for making ropes?